Schedule Observations Schedule Spectroscopic Observations
NameP21EXHF → C/2023 H3
Type Comet (Jupiter Family)
Status Actively Following
Characterization Target
Source LOOK Project
Check Spectroscopic Feasibility Create LC Plot
Recent Blocks Scheduled
  • No blocks have been scheduled
Measurements
Show Measurements
Plot Visibility
Last Update: 2025-Jul-22 00:00
Orbital Elements
MPC Comet
Epoch of elements (MJD)
61000.0 Nov. 21, 2025
Orbital inclination in deg 2.48835
Longitude of Ascending Node (deg) 55.08605
Arg of perihelion (deg) 193.24374
Eccentricity 0.6158131
Perihelion distance (AU) 5.2308019
Epoch of perihelion Feb. 18, 2024, 2:19 a.m.
Epoch of perihelion (MJD) 60358.09696
Total Magnitude (M1) 14.1
Slope Parameter (k1) 4.5
Physical Parameters
K1 autocmod 3.0f

6
4.5
M1 2 parameter fit from 68 observations, autocmod 3.0f

6
14.1 +/- 0.5
Diameter Initial Diameter Guess using H=13.7 and albedo=0.14 (0.01 to 0.5)

MPC Default
6463.4 m +17720.0 / -3043.0
Follow-up Details
NEOCP digest2 score 35
Number of observations 69
Arc length (days) 859.00
Time since last observation (days) 229.30
Spectroscopy Details
Known Taxonomies None